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+.Dd November 11, 2018
+.Dt INFLATECOPY 3
+.Os
+.
+.Sh NAME
+.Nm inflateCopy
+.Nd copy inflate stream
+.
+.Sh LIBRARY
+.Lb libz
+.
+.Sh SYNOPSIS
+.In zlib.h
+.Ft int
+.Fn inflateCopy "z_streamp dest" "z_streamp source"
+.
+.Sh DESCRIPTION
+Sets the destination stream
+as a complete copy of the source stream.
+.
+.Pp
+This function can be useful
+when randomly accessing a large stream.
+The first pass through the stream
+can periodically record the inflate state,
+allowing restarting inflate at those points
+when randomly accessing the stream.
+.
+.Sh RETURN VALUES
+.Fn inflateCopy
+returns
+.Dv Z_OK
+if success,
+.Dv Z_MEM_ERROR
+if there was not enough memory,
+.Dv Z_STREAM_ERROR
+if the source stream state was inconsistent
+.Po
+such as
+.Fa zalloc
+being
+.Dv Z_NULL
+.Pc .
+.Fa msg
+is left unchanged
+in both source and destination.